'use strict';
const semver = require('semver')
const colors = require('colors/safe')
const log = require('@white-cloud-cli/log')
const LOWEST_NODE_VERSION = '12.0.0'

class Command {
    constructor(argv) {
        // log.verbose('Command constructor', argv);
        if (!argv) {
            throw new Error('参数不能为空！')
        }
        if (!Array.isArray(argv)) {
            throw new Error('参数必须为数组！')
        }
        if (argv.length < 1) {
            throw new Error('参数列表为空！')
        }
        this._argv = argv;
        let runner = new Promise((resolve, reject) => {
            let chain = Promise.resolve();
            chain = chain.then(() => this.checkNodeVersion());
            chain = chain.then(() => this.initArgs());
            chain = chain.then(() => this.init());
            chain = chain.then(() => this.exec());
            chain.catch(err => {
                log.error(err.message);
            })
        })
    }

    initArgs() {
        this._cmd = this._argv[this._argv.length - 1];
        this._args = this._argv.slice(0, this._argv.length - 1);
    }

    checkNodeVersion() {
        // 获取当前Node版本号
        const currentVersion = process.version;
        // 对比最低版本号
        const lowestNodeVersion = LOWEST_NODE_VERSION
    
        if(!semver.gte(currentVersion, lowestNodeVersion)) {
            throw new Error(colors.red(`white-cloud-cli 需要安装 v${lowestNodeVersion} 以上版本的 Node.js`))
        }
    }
     
    init() {
        throw new Error('init 必须实现！');
    }

    exec() {
        throw new Error('exec 必须实现！');
    }
}

module.exports = Command;
